Incandescent-lamp socket.



A. L. WILLIAMS. INOANDESOENT LAMP SOCKET. APPLIOATION FILED JAN. 11, 1909.

921,935. I PatentedMay18,'1909.

entrain snares PATENT onn on.

ARTHUR L. WILLIAMS, OF WATERBURY, CONNECTICUT, ASSIGNOR OF ONE-HALF TO CHARLES DOESCHER, OF WATERBURY, CONNECTICUT.

INCAN DESOENT-LAMP SOCKET.

Specification of Letters Patent.

Patented May 18, 1909.

Application filed January 11, 1909. Serial No. 471,739.

following, when taken in connection with the 1 accompanying drawings and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specification and represent, in-

Figure l side view of socket for incandescent lamps constructed .in accordance with my invention. Fig. 2a side view of the shell and cap showlng the cap partially re-.

moved. Fig. 3 a top orplan view of the shell with the cap removed. Fig. f4 a sectional View on the lined-b of Fig. 1.' .Fig. 5 a broken side view illustrating the keyless socket.

This invention relates to an improvement in incandescent lamp sockets, and articularly to means for securing the shel to the cap, the object being a simple. arrangement of parts whereby the cap is firmly locked with the shell, but which permits of ready separation, and the invention consists in the construction hereinafter described and particularly recited in theclaims. I

r In carrying out my invention as herein shown, I employ a shell 2 of substantially usual design formed either with or without a deep notch 3 for a key l depending on whether or not a key is employed. Near the upper end of the socket is an annular groove 5, and secured in this groove is a spring ring 6. One end ofthis s ring is fastened to the socket, and this may e done in a variety of b As herein shown, slits are made in the ways. groove and the metal between the slits is thrown out of the sprin is turned out to form a finger 8. The cap 9 W the fixture in the usual way is formed near its lower edge with an internal annular groove 10 and with a narrow notch '11 in its lower edge. This notch is provided so. that the cap may be set down over the body and have the finger 8 of the spring enter the notch 11.

to form a bridge 7 beneath which the end of the spring is held. The free end -ch'is adapted to be attached to.

onto the socket. When it is in place the cap or socket is released and the spring will ro- -tate one with'relation to the other so that the spring will again expand and enter the groove in the cap, .and thereby unites-the cap shell, the two are ,turned with relation to each other so .as to compress the spring which permits the cap and body to be readily se arated. The locking function therefore takes lace automatically; the parts are conve held, yet permitted to be readily separate In ke sockets the key'prevents the orcelain b oek in the shell from turning; but in keyless sockets some means must be rovided to prevent this turning, and this l aocomplish by cutting away a portion of the groove 5 as indicated in Fig. 5, to form a clearance for the lug 12 fofined on the ewelain block 13. When in position the b ockis the sides ofv the lug with the si es of the groove in the body.

I claim 1- 1. An incandescent lamp socket com ris annular groove, a ring-like spring having one end secured in said groove and formed at its finger, combined with a cap having an annular groove, and a notch in its lower edge,

spring which between the whereby the substantially outwardly turned end of the spring is adapted to stand rooves in the shell and ca shell and cap are interlocked, as described.

An incandescent lamp socket com rising a shell formed near its upper end wit an annular groove, a ring-like spring having one end secured to the shell in said groove, the other end of the spring formed with an out- -wardly projecting finger a portion of said roove cut away,

ormed with a lug entering the cut-away nortion' of the groove, whereby the block is held L. against turning, a cap formed with an annuiently interlocked and when in place firml held against turning by the enga ement of.

ing a shell formed near its upper end wit an opposite end with an outwardly projectinga block within the shell- The cap thus engaging the end of the spring is turned upon the body which coils thespring and draws it into the groove 5 to such an extent that the cap may be passed down-"- and shell. To separate the cap from the which notch is;adapted to engage with the I lar groo ve, and a notch-in its lower end', said 'In testimony whereof, I have signed this notch adapted to engage withthe finger at specification in the presence of two subtheend off saidspring whereby said spring scribing witnesses.

may be contracted to permit the cap to be ARTHUR WILLIAMS.

passed over or removed from the of the\ Witnesses:

shell 'and interlocked therewith y said LoUIs A. EITEL, spring, substantially as described. WILLIAM TPLEGGETT. 

